First phase is incredibly boring if you dont get sent to a platform. Dodge bolts = win. Now if you get send to a platform i found dodging a fun as it was a break from the main platform. However I find bad that you need the help of an addon to really get through those side platforms cleanly. I mean you can memorize something like the charts provided here (http://www.icy-veins.com/sha-of-fear-detailed-strategy-wow) but realistically not many people can. Without Dreadspray addons it becomes much more of a hassle than it needs to be.
Second phase is fun. Loved it except for one thing and i am pretty sure i am not the only one to think this. The artwork is terrible. Just a blue mass of nothing. My 2 year old niece could have drawn the same area. It is almost as if Sha was the last encounter they designed and just wanted to get it over with.
One of the things that I am starting to dislike is the length of these final boss encounters. 20 mins for Sha and close to 15 with Empress. It seems like instead of the boss themselves being challenging that the times are extended to allow for more people to screw up. More phases repeated to challenge the raider to hold their attention that long.
My op - feel free to disagree :)